fe2+ +mno4- - fe3+ +mn2+
You need to find the caps key and learn how to use it. I assume you want this balanced. I assume this is n acid solution from the permanganate half reaction.
5Fe^2+ + MnO4- + 8H+ ==> 5Fe^3+ +Mn^2+ + 4H2O
fe2+ +mno4- - fe3+ +mn2+
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